Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 94 for “"Optical Sensor"”.
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Electro-optical sensor evaluation of airfield pavement
… c07179e23b120ec95fc27984054616ab (MD5) Electro-Optical Sensor Evaluation of Airfield Pavement by Stephanie Graves.docx: 54846006 bytes, checksum: 2444dd5964ace5f378ff780026a0ed96 (MD5) license.txt: 4066 bytes, checksum: 2dbaa1257d9f9f1432f0431612f88c77 (MD5)
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High throughput optical sensor arrays for drug screening
… report details the development of several novel sensor systems capable of detecting cellular ion flux in multi-well plate format. Optodes are employed as the primary sensors, which are an optically based ion selective polymer. These assays utilize both potassium and sodium selective optodes to …
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Design of a precise X-Y-Theta nanopositioning optical sensor
… larger than the target precision of the sensor, and it is still unclear whether sufficient precision is attainable with this system and software. This thesis also describes a previous attempt to perform this metrology using consumer-grade contact image sensor scanners, other elements of …
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Design of an integrated optical sensor with on-chip preprocessing
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Microgap Structured Optical Sensor for Fast Label-free DNA Detection
… Fabry-Perot interferometric (IFPI) based DNA sensor is presented with the intrinsic advantages of small size, low cost and corrosion-tolerance. This sensor has experimentally demonstrated its high sensitivity and selectivity. In theory, DNA detection is realized by interrogating the sensor's …
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Developing an optical sensor for the visualisation of pH gradients in marine sediments
… also been measured using fluorescent dye-based sensors, but their handling needs special light sources and filters and sensor membrane preparation is quite complex, which has restricted its use to laboratory studies. A simple optical pH sensor has been developed for this application by …
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Development of an optical sensor for real-time weed detection using laser based spectroscopy
… This thesis describes the development of a sensor for automatic spot spraying of weeds within crop rows. The sensor records the relative intensity of reflected light in three narrow wavebands using lasers as an illumination source. A prototype weed sensor which had been previously developed …
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Development of enhanced performance luminescence-based optical sensor systems for single-analyte and multii-analyte applications
Luminescence-based sensors are widely used and are the subject of considerable attention from both a research and a commercial perspective. This work details the development of enhanced-performance luminescence-based sensor systems. Development eorts have focussed on three areas: instrumentation …
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The properties of single crystal sapphire fibers and the polarimetric optical sensor for high temperature measurements
… fibers are investigated and a polarimetric optical sensor for high temperature measurements is designed. The polarization-maintaining properties of single crystal sapphire fibers are investigated experimentally for different modal power distributions and different fiber lengths. Experimental …
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On a dual wavelength optical sensor system for measuring strain and temperature simultaneously in tokamak port plug
… This thesis demonstrates that using electrical sensors in the supporting structures of a fusion reactor for measuring strain and temperature will be strongly affected by the ionising radiation and the electromagnetic fields. This is because it was found that errors of over 100% can be present on …
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Nanoporous glass-ceramics transparent in infrared range to be used as optical sensor-Mechanical and viscoelastic properties of the TAS (Te-As-Se) glass
… surfaces were synthesized and tested as optical elements. The nanoporosity is obtained through a two-step process, including controlled nucleation of CsCl nuclei in the glass matrix followed by selective etching of the nuclei with an acid solution. The porous surface is several hundred …
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Optical Temperature Monitoring of Electrical Power Transformer Networks
This thesis presents an optical sensor network model designed to monitor temperature of transformers at multiple substations from one central location. Fiber Bragg Grating (FBG) has been used as the optical sensing element for transformer temperature monitoring. Suitable FBG parameters and …
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Novel integrated paired emitter-detector diode flow analysis system
… programme of research at the National Centre of Sensor Research has focussed on the development of a miniaturized detection system based on the concept of a Paired Emitter-Detector Diode (PEDD) LED optical sensor as a generic optical sensor platform for colorimetric analysis as developed within …
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Control of a fast steering mirror for laser-based satellite communication
… Mirror to remove any spacecraft jitter from the optical path. The optical path in the satellite must have no more that 400 nanoradians RMS motion from 1 Hz to 1 kHz. This thesis focuses on the feedback control of this Fast Steering Mirror (FSM). The feedback on the FSM comes from two different …
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SENSING COVERAGE AND RESOURCE ALLOCATION ALGORITHMS IN SENSOR NETWORKS
Sensor network has emerged as one of the hottest research areas recently. It has a wide range of applications; namely, security sensing in military defense systems, environment monitoring, manufacturing surveillance, human healthcare monitoring, etc. In this project, we investigate two scenarios of …
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Multivariable analysis of spectral measurements for the characterization of semiconductor processes
The availability of affordable and reliable optical sensor technology and the abundance of data that these sensors now provide have created new opportunities to better characterize and control semiconductor processes in real-time. This thesis focuses on the analysis of multivariate methods and …
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Fast star tracker centroid algorithm for high performance CubeSat with air bearing validation
… high bandwidth piezoelectric stage performs fine optical stabilization. The optical sensor provides star images from which a centroiding algorithm estimates the star locations on the optical focal plane. The star locations are used for both the optical control loop and satellite attitude …
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